Many people believe we will face environmental disasters ________

Many people believe we will face environmental disasters _________ we completely change the way we live.

#57124

but

though

unless

until

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They will not start the work _______ their teacher comes back.

#58093

while

until

as soon as

 –_______ do you spell pencil? - P- E-N-C-I-L.

#56074

How

What

Where

Who

 It’s five years _____ our teacher came to Jiangyan.

#58486

since

when

although

 —Would you like to go for a walk with me?—I’d love to, ________I’m afraid I have to finish my homework first.

#56529

but

and

It’s very late at night,  ____ our teacher is still working .

#58417

and

but

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